SPARC: NFS/RDMA Connection Errors (6229077)

Connection errors might occur between an NFS server and client that
are using Remote Direct Memory Access (RDMA). Because of these errors, the
buffer pool resources are exhausted and the system panics. The following error
message is displayed:

rpcib: WARNING: rib_rbuf_alloc: No free buffers!

Workaround: Choose one of the following
workarounds:

Configure the NFS server to enable TCP. In the /etc/default/nfs file, change (NFSD_PROTOCOL=tcp).

Mount the NFS file system from the client side with the proto=tcp mount option.